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Search: id:A140230
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| A140230 |
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Binomial transform of [1, 2, -3, -4, 5, 6, -7, -8, 9, 10,...]. |
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+0
1
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| 1, 3, 2, -6, -20, -28, -8, 56, 144, 176, 32, -352, -832, -960
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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A007318 * [1, 2, -3, -4, 5, 6, -7, -8, 9, 10,...]; i.e. (+) signs when n == 1 or 2 MOD 4; (-) otherwise.
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EXAMPLE
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a(4) = -6 = (1, 3, 3, 1) dot (1, 2, -3, -4) = (1 + 6 - 9 - 4).
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CROSSREFS
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Adjacent sequences: A140227 A140228 A140229 this_sequence A140231 A140232 A140233
Sequence in context: A007812 A082561 A110768 this_sequence A025240 A137602 A018864
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KEYWORD
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sign
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), May 13 2008
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